Bilateral inter-comparison in the gas flow range from 0.5 m3/h to 75 m3/h with sonic nozzles

Project Description

Sonic nozzles (4 pieces) with nominal flow rates 0.5 m3/h, 16 m3/h, 32 m3/h, 75 m3/h will be used to compare primary low-pressure test facilities.The laboratories should carry out the calibration using their common procedures.The procedure described in PTB Testing Instruction Volume 25: "Gas meters – Test rigs with critical nozzles" is recommended to be used. The parameters QV,20,tr,1000 [L/h] and cpE [-] are required to be determined for each sonic nozzle.
Each laboratory will be responsible for the transfer of the sonic nozzles to the next laboratory. No other costs are expected.

Test conditions:

  • Test gas: air
  • Upstream sonic nozzle pressure: near atmospheric
  • Test temperature: (19.5 ÷ 22.5) °C

Final Report 2021-06-17

The project has been completed and the report can be downloaded here>>.

Flow (F)
Coordinating Institute
CMI (Czechia)
Participating Partners
SMU (Slovakia)